基于偏振特性的液晶光开关原理研究

根据液晶响应速度快,对光的吸收少的特性,研究了液晶光开关的工作原理,并与其它光开关相比较,分析了液晶光开关在光纤通讯方面的应用前景,建立了三种液晶光开关的物理模型。     

Ferroelectric liquid crystals: The 2004 Benjamin Franklin Medal in Physics presented to Robert B. Meyer of Brandeis University

In a theoretical examination of the structures of liquid crystal phases, Robert B. Meyer in 1975 creatively utilized symmetry arguments to predict that tilted, layered liquid crystal phases of chiral molecules are ferroelectric. He then engaged the help of organic chemists to synthesize a compound that might possess such a phase, and once the material was in his hands, Meyer not only verified its ferroelectricity, but also suggested how such a phase could be used for extremely fast displays. This discovery of ferroelectricity in a fluid system with the possibility for unique applications surprised the entire condensed matter research community and quickly paved the way for both increased scientific understanding and significant technological advancement. For this creative synthesis of theory and experiment, Meyer was awarded the 2004 Benjamin Franklin Medal in Physics.     

基于超声测距的可视倒车雷达预警系统设计

针对汽车倒车碰撞事故,设计了以单片机为核心的倒车雷达预警系统,它利用超声波实现无接触测距;利用温度传感器实现温度补偿,使测距精确;利用液晶显示实现距离可视;同时具备语音报警的功能。实验表明,该系统测距范围、测距精度可以满足系统要求,具有较高的应用价值。     

可编程注射泵控制系统中LCD控制器T6963C的应用

为了减小了医务人员在工作紧张、简单的重复性较高的操作过程中犯错的机率,对各阶段的输入过程一目了然,本文以主控芯片TMS320LF2407A为主,在进行注射泵设计时,采用TOSHIBA公司生产的一款LCD控制器T6963C,提出了一种全新的显示模式--坐标显示。点阵式液晶显示模块性能稳定、价位较低,适合应用于便携式智能仪器仪表,是一种具有较高显示功能的显示器件。本文介绍了一种DSP控制器的设计方法,用于对内藏T6963C控制器液晶模块进行字符图形显示控制,给出了硬件接口的设计实现以及软件流程图。     

基于MCS51的出租车计价器设计与仿真

在分析现有出租车计价器的基础上,介绍一种以MCS51单片机为控制核心,采用A44E集成开关型霍耳传感器进行测距,LCD1602液晶显示模块作为费用显示,采用DS1302实时时钟电路模块、AT24C02外部数据存储模块等。设计出一简易出租车计价系统。文章给出了硬件电路及主程序流程,阐述了软、硬件设计过程中关键技术的处理方法。经proteus软件仿真表明：该系统功能运行稳定,计费准确,满足出租车分时、分场景计价功能,能够达到实际应用目的。     

液晶电脑显示器的生命周期评价

液晶显示器在其生产制造和使用等阶段将产生对环境和人群健康不利的各种因素。应用生命周期评价方法对其制造和使用阶段原辅材料、能源和污染物质进行影响评价分析,减少环境影响贡献最大的影响因子使用量。该结果对消费者进行产品选择和生产者进行改进产品结构都具有一定的现实意义。     

一种未来的计算机--三值光计算机

三值光计算机研究是众多新型计算机研究中的一种,其研究目的是尽快构造出充分发挥光的优点、实际可行、通用性强的光计算机。理论和实验成果都表明：它将有数万位的数据宽度。适合于处理具有高度并行性的问题。在它的结构中充分发挥了光和电子计算机的优点。相辅相成。由于使用的主要基础器件是已经商品化的二维液晶器件,所以是一个比较容易实现的未来计算机系统。     

嵌入式高温沸腾炉控制系统设计

基于单片机的高温沸腾炉控制系统已经成型。现利用SPCE3200嵌入式系统促其升级,加强系统集成度,传感器数据可以无线传入。采用液晶显示器显示工艺曲线,并允许通过触摸屏手工修改曲线,增加了多媒体、通信等功能,系统更加安全可靠,具有高适应性、易扩展性,有助于生产质量的提高。     

Crystal face dependent intrinsic wettability of metal oxide surfaces

Knowledge of intrinsic wettability at solid/liquid interfaces at the molecular level perspective is significant in understanding crucial progress in some fields, such as electrochemistry, molecular biology and earth science. It is generally believed that surface wettability is determined by the surface chemical component and surface topography. However, when taking molecular structures and interactions into consideration, many intriguing phenomena would enrich or even redress our understanding of surface wettability. From the perspective of interfacial water molecule structures, here, we discovered that the intrinsic wettability of crystal metal oxide is not only dependent on the chemical components but also critically dependent on the crystal faces. For example, the crystal face of α-Al₂O₃ is intrinsically hydrophobic with a water contact angle near 90°, while another three crystal faces are intrinsically hydrophilic with water contact angles <65°. Based on surface energy analysis, it is found that the total surface energy, polar component and Lewis base portion of the hydrophobic crystal face are all smaller than the other three hydrophilic crystal faces indicating that they have different surface states. DFT simulation further revealed that the adsorbed interfacial water molecules on each crystal face hold various orientations. Herein, the third crucial factor for surface wettability from the perspective of the molecular level is presented, that is the orientations of adsorbed interfacial water molecules apart from the macro-level chemical component and surface topography. This study may serve as a source of inspiration for improving wetting theoretical models and designing controllable wettability at the molecular/atomic level.     

仓库温湿度检测系统设计

本仓库温湿系统检测以STC89C52为控制核心,通过DHT11数字温湿度传感器,实时采集仓库环境的温度、湿度,并利用LCD液晶显示屏1602显示数据,达到实时监控温湿度的目的。     

Halogen bonding in the co-crystallization of potentially ditopic diiodotetrafluorobenzene: a powerful tool for constructing multicomponent supramolecular assemblies

Halogen bonding is emerging as a significant driving force for supramolecular self-assembly and has aroused great interest during the last two decades. Among the various halogen-bonding donors, we take notice of the ability of 1,4-diiodotetrafluorobenzene (1,4-DITFB) to co-crystallize with diverse halogen-bonding acceptors in the range from neutral Lewis bases (nitrogen-containing compounds, N-oxides, chalcogenides, aromatic hydrocarbons and organometallic complexes) to anions (halide ions, thio/selenocyanate ions and tetrahedral oxyanions), leading to a great variety of supramolecular architectures such as discrete assemblies, 1D infinite chains and 2D/3D networks. Some of them act as promising functional materials (e.g. fluorescence, phosphorescence, optical waveguide, laser, non-linear optics, dielectric and magnetism) and soft materials (e.g. liquid crystal and supramolecular gel). Here we focus on the supramolecular structures of multicomponent complexes and their related physicochemical properties, highlight representative examples and show clearly the main directions that remain to be developed and improved in this area. From the point of view of crystal engineering and supramolecular chemistry, the complexes summarized here should give helpful information for further design and investigation of the elusive category of halogen-bonding supramolecular functional materials.     

基于AT89C51单片机的水箱水位检测控制系统设计

本文介绍电路接口原理图,给出相应的软件设计流程图和汇编程序,并用Proteus软件仿真进行测试。设计了一种基于AT89C51单片机的水箱水位检测控制系统,该系统能实现水箱水位自动检测、处理、水位溢出报警和液晶显示水位等功能。     

基于单片机的语音遥控硬件系统设计

红外线遥控就是利用红外线传递控制信号,实现对控制对象的远距离控制。系统以AT89S52单片机为核心控制器实现红外线遥控语音录放功能,主要由红外发射部分、红外接收及单片机控制部分、液晶显示部分和语音录放部分组成,并且提供红外线遥控和近距离机械按键两种系统操作方式,同时带有实时显示系统工作状态的液晶显示功能,能实现对音频信号进行高保真度的录放过程。     

基于专利分析的技术发展趋势预测研究——以液晶材料技术为例

随着社会经济飞速增长,技术发展日新月异,致使技术创新模式发生重大变革。之前对技术发展趋势分析多数局限于定性和定量的研究。因此,本文创新性的引入SAO结构分析方法,利用相关软件挖掘出专利的SAO结构,并据此设计算法计算专利之间相似度,结合专利地图分析相关技术的发展方向及趋势,形成基于专利数据的技术发展趋势研究框架。最后以液晶材料技术为例,进行了实证研究,技术重点已经由基础技术的研发转向更高效、成本低的大规模的材料研发。这些研发背景为企业制定发展战略和了解技术进步提供理论基础。     

基于专利引文网络的技术范式转换预见方法体系构建——以液晶材料技术的发展为例

面对具有非线性、高不确定性等特点的技术范式转换现象的频繁出现,目前基于线性思维的技术预见方法已无法满足现实需要。对此,本文旨在探讨一种科学有效、具有可操作性的技术范式转换预见方法。阐述技术范式转换的特征及内在动因,通过理解技术范式转换的一般过程,建立技术范式转换理论模型,基于社会网络思维结合专利引文网络构建了技术范式转换预见方法体系,并以液晶材料技术的发展为例进行实证分析。研究结果不仅丰富了技术范式转换的理论研究,也为企业提供战略决策以及行业技术研究方向。     

电子产品供应链碳足迹优化研究

以液晶显示器为例,由供应链碳足迹测算模型计算可知,碳足迹主要来自产品的生产转化活动,供应链企业之间可以通过协同合作,共同减少供应链碳足迹。     

一种土壤湿度检测系统设计

本文设计了一种无线土壤湿度采集装置,该装置通过湿度传感器HS1101对土壤湿度进行采集,然后将采集到的数据通过无线模块PTR2000发送出去,接收方接收到数据后解包,计算出湿度值并在液晶屏上显示。系统发射部分以AT89S52为核心,包括湿度采集、无线发射。接收部分也以AT89S52为核心,将无线接收、液晶显示结合起来,通过适当的软、硬件抗干扰处理,该系统具有实用性、小型化等特点。     

A powder method for the high-efficacy evaluation of electro-optic crystals

The electro-optic crystal holds great promise for extensive applications in optoelectronics and optical communication. However, the discovery of novel electro-optic crystals is sporadic due to the difficulties of large-sized crystal growth for electro-optic coefficient measurement. Herein, to address this issue, a high-efficacy evaluation method using accessible powder samples is proposed in which the second-harmonic-generation effect, infrared reflectance spectrum and Raman spectrum are introduced to predict the magnitude of the electro-optic coefficient. The calculated electro-optic coefficients of numerous reported electro-optic crystals through this approach give universal agreement to the experimental values, evidencing the validity of the strategy. Based on this method, CsLiMoO₄ is screened as a novel potential electro-optic crystal and a high-quality crystal is grown by the Czochralski technique for electro-optic coefficient measurement using the half-wave voltage method, the result of which is also comparable to the calculated value. Consequently, the evaluation strategy presented here will pave a new way to explore promising electro-optic crystals efficiently.     

光子晶体光纤的特性及应用概述

光子晶体光纤（PCF）是一个新兴的研究领域,其传输机理与传统光纤相比有本质的区别,在光通信和光纤传感等领域引起了科研工作者的极大兴趣。文章介绍了两种最基本的光子晶体光纤,分别为全内反射型 PCF 和光子带隙型 PCF,并对光子晶体光纤具有的优异特性和应用领域进行了简要概括。